1、 Recommendation ITU-R BT.2072-0 (02/2015) Main functionalities of consumer receivers for worldwide broadcasting roaming BT Series Broadcasting service (television) ii Rec. ITU-R BT.2072-0 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economica
2、l use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by Worl
3、d and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used fo
4、r the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series
5、of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermina
6、tion, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Satelli
7、te news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2015 ITU 2015 All rights reserved. No part of this publicat
8、ion may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R BT.2072-0 1 RECOMMENDATION ITU-R BT.2072-0 Main functionalities of consumer receivers for worldwide broadcasting roaming (2015) Scope This Recommendation defines main functionalities of consumer receivers f
9、or worldwide broadcasting roaming. The list of the functionalities given in the Recommendation should be taken into account for the development and production of modern and prospective consumer receivers of TV, multimedia and sound broadcasting. Keywords Consumer receiver, functionality, worldwide b
10、roadcasting roaming The ITU Radiocommunication Assembly, considering a) that there is an increasing demand to use portable broadcast receivers worldwide, and a consumer may use his receiver when travelling; b) that various digital TV, multimedia and sound broadcasting systems for fixed, portable and
11、 mobile reception and their parameters are described in ITU-R Recommendations and Reports; c) Report ITU-R BT.2295 contains the characteristics of systems for digital terrestrial sound, multimedia and TV broadcasting for fixed, portable and mobile reception; d) that TV, multimedia and sound broadcas
12、ting operates on various frequency bands in various parts of the world; e) that there are many source-coding systems and channel-coding systems in use for TV, multimedia and sound broadcasting, some of them currently in widespread use, others in use in some countries only, and others already documen
13、ted and tested but not yet widely used; f) that Question ITU-R 136-2/6 defines worldwide broadcasting roaming as “the possibility for a consumer to receive radio, multimedia or television programmes of interest in any location of the world where those programmes are available, using a single receive
14、r irrespective of the broadcasting platform on which those programmes are delivered at that location“; g) that several of functionalities of consumer receivers for worldwide broadcasting roaming are already mentioned in Recommendations ITU-R BS.774, BS.1114 and BS.1348; h) that Report ITU-R BT.2267
15、contains information on integrated broadcast-broadband systems that could be considered in worldwide broadcasting roaming, namely public alert in case of a crisis and appropriate actions in case of emergency; i) that a new global platform for the broadcasting service is under study within the ITU-R,
16、 2 Rec. ITU-R BT.2072-0 recommends that, in order to receive, demodulate and decode broadcast signals in any part of the world, consumer receivers for worldwide broadcasting roaming should support the main functionalities listed in Annex 1. Annex 1 Main functionalities of consumer receivers for worl
17、dwide broadcasting roaming Main functionalities of the consumer receivers for worldwide broadcasting roaming should supply the tasks according to the definition given in the considering e). These functionalities could be divided into some groups. 1 Main functionalities for supporting travelling The
18、very concept of worldwide broadcasting roaming implies that a consumer may also use his receiver when travelling. Consequently a receiver for worldwide broadcasting roaming: should be reasonably compact and lightweight; should be powered from batteries (possibly rechargeable) and from the mains; sho
19、uld be able to operate on batteries over a period of many hours; should be designed to receive and present both TV, multimedia and sound broadcasting program content at a reasonable level of perceptual image/sound quality; should provide prioritized public alert and additional appropriate emergency
20、information available from broadcasting; should be preferably supplied with a simple indicator of the received RF field level and of the bit error rate. 2 Main functionalities for supporting various broadcasting systems Television, multimedia and sound broadcasting operates on various frequency band
21、s in various parts of the world, and there are many source-coding systems and channel-coding systems. Consequently a consumer “multimode” receiver for worldwide broadcasting roaming should be able: to tune to all the frequency bands in use for TV, multimedia and sound broadcasting in widespread use
22、in the world; to demodulate, channel-decode and source-decode sound, multimedia and TV broadcast signals that are modulated and encoded in any of the various systems in widespread use in the world, by automatically switching to the appropriate demodulator and decoder stored in its memory; to store s
23、oftware decoders for new or little-used channel-coding and source-coding systems that are not yet available in its digital memory and that the receiver owner may download from the web; Rec. ITU-R BT.2072-0 3 to tune automatically as well as manually (optional); this includes automatic switching to t
24、he demodulator, channel-decoder and source-decoder used on the tuned channel; to receive broadcasting content that is delivered via non-broadcasting means, for example, broadband fixed or mobile telecommunication networks; to prevent reception of non-public communication, legally restricted by sever
25、al Administrations. 3 Main functionalities for supporting programmes information A consumer receivers for worldwide broadcasting roaming should be designed to be “user-friendly“, namely it should help the user to rapidly find the sound, multimedia or TV programmes of his interest. Indeed, automatic
26、tuning of a consumer receiver for worldwide broadcasting roaming will generally result in a list of those channels that the receiver can tune to, and successfully demodulate and decode. However, for the receiver to really be user-friendly, such list should also provide information on the channel con
27、tent, including: the name of the station and the quality of reception; the title of the program, assuming that this helps to form an idea of its content; the genre of the program (e.g.: sports, news, music, etc.) and its sub-genre (e.g.: tennis, soccer, etc. as sub-genres of sports); the program lan
28、guage, for programs with speech content, etc. Such information, with the exception of the one on the quality of reception which is generated inside the receiver, should be presented to the user in a language at the users choice. Consequently it should be delivered to the receiver in a standardized form, i.e. by means of standardized metadata multiplexed on the program stream. _
